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Author
Topic: Modbus RTU (Read 7384 times)
BLL
Sr. Member
Posts: 276
Modbus RTU
«
on:
October 08, 2016, 10:13:25 pm »
Hi, I need to read /write a device (EpSolar Tracer solar controller) which uses the Modbus RTU protocol. I have never used Modbus before.
Are there any libraries or tutorials already available to help?
I have read up on the protocol but can't as yet get my device to say anything!
Brian
Logged
molly
Hero Member
Posts: 2330
Re: Modbus RTU
«
Reply #1 on:
October 08, 2016, 10:22:32 pm »
perhaps
PascalSCADA
is able to help you out there ?
Logged
tr_escape
Sr. Member
Posts: 432
sector name toys | respect to spectre
Re: Modbus RTU
«
Reply #2 on:
October 08, 2016, 10:35:26 pm »
Have you got modbus address list of this device?
As Molly mentioned pascalscada has got modbus driver you can read and write to device if supports.
Logged
BLL
Sr. Member
Posts: 276
Re: Modbus RTU
«
Reply #3 on:
October 08, 2016, 10:59:03 pm »
Hi all, Thanks for the replies.
Yes, I have downloaded the manufacturer's specification, which has all the commands for reading/writing the device.
I will look at pascalscada, which I don't know at all.
Thanks
Brian
Logged
avra
Hero Member
Posts: 2514
Re: Modbus RTU
«
Reply #4 on:
October 11, 2016, 10:41:55 am »
Using PascalSCADA is nice, but might be an overkill if your needs are simple. For such cases you might want to just use mbutils lib:
http://forum.lazarus.freepascal.org/index.php?topic=11131.0
it is much better if you first establish a successful communication with your device using some modbus client like this free one:
http://www.modbusdriver.com/modpoll.html
p.s. There is a search in forum, you know...
«
Last Edit: October 11, 2016, 10:46:07 am by avra
»
Logged
ct2laz
- Conversion between Lazarus and CodeTyphon
bithelpers
- Bit manipulation for standard types
pasettimino
- Siemens S7 PLC lib
sadikacar60
Guest
Re: Modbus RTU
«
Reply #5 on:
February 22, 2019, 08:54:45 am »
friends pascal scada with plc say qp0 relay want to set. How can I do with pascalscada easily with the delphimodbus component.
Yours truly
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
Button3Click
(
Sender
:
TObject
)
;
begin
TCP_UDPPort1
.
Host
:
=
'169.254.230.191'
;
TCP_UDPPort1
.
Port
:
=
502
;
TCP_UDPPort1
.
WriteState
(
???
)
;
end
;
windows also made with delphi modbus component
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
begin
IdModBusClient1
.
Host
:
=
'169.254.230.191'
;
if
IdModBusClient1
.
WriteRegister
(
1
,
1
)
then
//register-deger 1-0
else
MessageDlg
(
'PLC register write failed!'
,
mtError
,
[
mbOk
]
,
0
)
;
end
;
Logged
mig-31
Sr. Member
Posts: 305
Re: Modbus RTU
«
Reply #6 on:
February 22, 2019, 09:55:27 am »
It's so easy.
Look in PascalScada component examples directory and you can do it.
Logged
Lazarus 2.2.6 - OpenSuse Leap 15.4, Mageia 8, CentOS 7
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